Definition of sicilicus:
(n) :
(Old Latin typography) A diacritic, resembling a 180°-rotated ‘C’ (i.e., being similar in appearance to ⟨ᵓ⟩), written atop a consonant to mark gemination, superseded in Classical Latin by doubling the letter representing the geminated consonant.
(n) :
(Roman measurements) An unit of weight equal to one quarter of an uncia.